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DURABLE AQUATIC-GRADE POLYPROPYLENE – Strong diamond-cut filter grid designed for building, modifying and expanding aquarium and pond filtration systems. Suitable for both freshwater and saltwater applications. GENEROUS 680 x 400MM SIZE – Each filter grid measures approximately 680 x 400mm (27" x 16"), providing a practical base for supporting filter media in a wide range of custom filtration setups. 15MM THICK WITH OPEN GRID DESIGN – Substantial 15mm (1/2") profile with approximately 18mm (5/8") diamond openings, allowing water to flow freely through the grid while providing dependable support for filter media. EASY TO CUT & CUSTOMISE – Polypropylene construction can be trimmed to suit your required filter dimensions, making it ideal for custom sumps, trickle filters, pond filters, aquarium filtration chambers and DIY filter projects. JOIN MULTIPLE GRIDS FOR LARGER FILTERS – Need more coverage? Multiple panels can be positioned together and secured using cable ties to create a larger filter platform. Also available from Aquacadabra in a Square Cut design.